Expanding available pyrazole substitution patterns by sydnone cycloaddition reactions
作者:A.W. Brown、J.P.A. Harrity
DOI:10.1016/j.tet.2017.04.049
日期:2017.6
We report the use of alkynylsilanes for the regiocontrolled synthesis of pyrazoles from functionalised sydnones. The strategies outlined herein allow a range of pyrazoles to be accessed with substitution patterns that are otherwise not directly obtained with high selectivity by alkyne cycloadditions. Moreover, this study serendipitously highlighted a simple and convenient procedure for the synthesis